string(235) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=javac%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E9%85%8D%E7%BD%AE%E4%B8%8D%E6%88%90%E5%8A%9F => Received HTTP code 403 from proxy after CONNECT"
javac环境变量配置不成功
